[IAUC] CBET 1134: 20071113 : RR TELESCOPII

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                                                  Electronic Telegram No. 1134
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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RR TELESCOPII
     J.-U. Ness and S. Starrfield, Arizona State University; J. P. Osborne
and K. Page, University of Leicester; and G. Schwarz, West Chester University,
report that two Swift XRT observations of RR Tel, a symbiotic nova that
exploded in 1944, were obtained on 2007 Sept. 30 and Oct. 1 with a total
integration time of 3708 seconds.  The count rate obtained from the merged
observations is 0.005 +/- 0.001 counts per second (cps).  All source photons
were registered with energies below 1 keV, indicating a soft source.  This
observation was compared with a ROSAT observation taken in April 1992, for
which Jordan et al. (1994, A.Ap. 283, 475) report a count rate of 0.18 cps
and determined a temperature of 142 kK from stellar atmosphere modeling.  The
expected Swift XRT count rate obtained with PIMMS, based on the ROSAT count
rate and a blackbody model with kT = 0.012 keV, is consistent with the
new measurements.  Thus, the source appears to not have changed over the past
15 years.


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                         (C) Copyright 2007 CBAT
2007 November 13                 (CBET 1134)              Daniel W. E. Green